<html>

<head>
    <meta charset="UTF-8">
    <title>js的三种用法</title>
    <script src="main.js"></script>
    <!-- 最新版本的 Bootstrap 核心 CSS 文件 -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" integrity="sha384-BVYiiSIFeK1dGmJRAkycuHAHRg32OmUcww7on3RYdg4Va+PmSTsz/K68vbdEjh4u" crossorigin="anonymous">
    <!-- 可选的 Bootstrap 主题文件（一般不用引入） -->
    <link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap-theme.min.css" integrity="sha384-rHyoN1iRsVXV4nD0JutlnGaslCJuC7uwjduW9SVrLvRYooPp2bWYgmgJQIXwl/Sp" crossorigin="anonymous">
</head>

<body>
    <div class="container">
        <h1>水循环的三种形式</h1>
        <div class="row">
            <div class="col-xs-4">
                <section>
                    <h2>海陆间循环</h2>
                    <p>维持全球水的动态平衡和不断更新的状态。</p>
                </section>
            </div>
            <div class="col-xs-4">
                <section>
                    <h2>陆上内循环</h2>
                    <p>使海陆之间实现物质迁移和能量交换。</p>
                </section>
            </div>
            <div class="col-xs-4">
                <section>
                    <h2 onclick="alert('inline')">海上内循环</h2>
                    <p>影响全球的气候和生态，塑造者地表形态。</p>
                </section>
            </div>
        </div>
    </div>
    <script>
    // alert('js');
    </script>
</body>

</html>